import React,{useState,useEffect,useRef} from 'react'
import ArrUpdate from './studyHooks/UseState'
function App() {
  return (
    <div className="App">
      <header className="App-header">
        <p>study Hooks</p>
      </header>
      <ArrUpdate></ArrUpdate>
    </div>
  );
}
export default App;
